AHU Cooling Coil Design Calculation (Step-By-Step Clear Guide)

A step-by-step guide on how to size AHU cooling coil from sensible cooling load to calculating the AHU airflow, identifying the on/off coil conditions and finding the on/off coil enthalpy for coil load calculation.

[@aircondlounge]

Understanding cooling coil design helps us to not only size AHU appropriately but also have the skills to troubleshoot many air conditioning problems. Learn more in my Psychrometric Analysis Course: course.aircondlounge.com/psychrometric-analysis-course Cooling load calculation: course.aircondlounge.com/rts-cooling-load-calculation-course

[@GalacticAdventures69]

My goodness dude, you saved my ass at work. Will be buying your courses as well. You the man!

[@aircondlounge]

Is it? How that happened. Anyway, thanks.

[@sinunlinu]

Awesome I m from India very good explanation.😊

[@aircondlounge]

Thanks

[@vanzproject9378]

Im from indonesia , thanks sir you are amazing ,

[@aircondlounge]

It’s nice to meet you!

[@sadeghnaderi4129]

@aircondlounge if your AHU is CAV you can add sensible heat to get total sensible heat. if AHU is VAV then you can nod add the max of each zone sensible heat together

[@aircondlounge]

For VAV AHU, you should apply a diversity factor to the total sensible heat you mean?

[@sadeghnaderi4129]

@@aircondlounge you should calculate total sensible load of all zones hourly to find the worst scenario with highest load, not just add the load of each zones together. because they can not occur at the same time to add them together

[@aircondlounge]

For load calculation yes. However, if those zones are serve by one AHU, adding the max load at each zone at different hour will lead to oversizing because when one zone is at max load, it doesn’t necessarily means the other zones are at max load as well. So, sum up the load by the same hour and choose the highest one should be the optimal approach.

[@sadeghnaderi4129]

@@aircondlounge yes thats what I mean. So you select the hour with highest load?

[@aircondlounge]

Because this video is about coil sizing, the sensible loads are just an example. In load calculation, I do calculate by hourly and pick the highest load hour.

[@user-jw7gh5py3v]

Where can i get the copy for psychometric chart same as what you use in the video?

[@aircondlounge]

It is extracted from the ASHRAE Handbook. You may try google it though.

[@user-jw7gh5py3v]

@@aircondlounge ok thanks a lot. :)